So I got a IPS DX2BB-CXCS motor for my pico moth
which weights around 6 oz. That is a C gear.
I am using a 7.4 Volt 250 mAh ETEC battery.

The GWS website says to use a GWS EP 1260 PROP.
It's HUGE! When the plane is on the ground the prop hits the
ground instead of the front wheels.
I must be using the wrong prop.

What prop should I be using?
I tried a 9070 and it flew but not much power.

Maybe I got the wrong motor for my plane?

Please help.

Correct motor gearbox is an AXCs which has a ratio of 5.9:1 whereas the CXCS you have has a ratio of around 8:1. My stock TM flies fine with either a 9x7 or 10x4.3. At 8:1 your 9070 is just not spinning fast enough. HTH

The Tigermoth is a great Isp Plane I have converted all mine Moths over to use lipo battery packs a 2 cell 7.4 volt 1200 pack will kep your Tigermoth in the air for allmost 1 hour with throttle managment.

you you can get a bunch of 10 minute flights out of one pack!

now if you have 2 or 3 packs you can fly all day!

I fly I think with a ep1080 prop on mine most of the time with good results.

I also make all my servo holders out of epp foam for the inside guts real easu and adds no weight.

Took my pico moth out this morning.
IPS A drive and a 9070 prop 250 mAh ETEC lipo. It flew.
Didn't climb like when I first put it together.
Pretty much flew full throttle the whole time.
Tried to get it pretty high so I could do some stunts.
It said NO WAY!

Weighs around 6.5 ounces.
Been in alot of wrecks. Glued back up alot.
Is that heavy?